Chicago Marathon

Chicago, IL, USA · October 11, 2026

57°·60° high·Breezy·Dry

Weather

Race Day Weather

57°at start

61° high

Breezy

Dry

Cool start, moderate winds expected

Runners will face temperatures starting at 57°F and peaking at 61°F, with an average humidity of 71%. Winds will begin with a tailwind in Mile 1 but shift to a headwind from Miles 2-8, requiring pacing adjustments. Hydration should be prioritized early, especially during the warmer stretches, and runners should prepare for gusty conditions up to 22 mph in exposed areas.

Race day forecast available in 140 days

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Distance: 26.2mi

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Race Info

The Chicago Marathon is a marathon (long-distance foot race) held every October in Chicago, Illinois. It is one of the six World Marathon Majors. Thus, it is also a World Athletics Label Road Race. The Chicago Marathon is the fourth-largest race by number of finishers worldwide. Wikipedia

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FAQ

When is the 2026 Chicago Marathon?

The 2026 Chicago Marathon will be held on Sunday October 11, 2026.

Is the Chicago Marathon a Boston Marathon Qualifier?

Yes, the Chicago Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Chicago Marathon?

The forecast calls for a high of 63°F and a low of 55°F with a 13% chance of rain.

Historical Weather

Based on 26 years of data

Avg Temp

64°F

L:51° H:64°

RunScore

Conditions

Rain Freq

12%

3 of 26 yrs

Wind11mph

Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Chicago Marathon Partly cloudy throughout the day. 2025	52°/67°	-	47°
2024 Chicago Marathon Partly cloudy throughout the day. 2024	59°/66°	-	49°
2023 Chicago Marathon Partly cloudy throughout the day. 2023	47°/55°	-	36°
2022 Chicago Marathon Becoming cloudy in the afternoon. 2022	46°/68°	-	35°
2021 Chicago Marathon Partly cloudy throughout the day with afternoon rain. 2021	72°/75°	Light	62°
2020 Chicago Marathon Partly cloudy throughout the day. 2020	60°/67°	-	53°
2019 Chicago Marathon Partly cloudy throughout the day. 2019	42°/54°	-	32°
2018 Chicago Marathon Cloudy skies throughout the day with rain. 2018	58°/60°	Light	56°
2017 Chicago Marathon Partly cloudy throughout the day. 2017	57°/77°	-	53°
2016 Chicago Marathon Partly cloudy throughout the day. 2016	52°/63°	-	44°
2015 Chicago Marathon Partly cloudy throughout the day. 2015	54°/77°	-	48°
2014 Chicago Marathon Becoming cloudy in the afternoon with late afternoon rain. 2014	44°/62°	-	39°
2013 Chicago Marathon Clear conditions throughout the day with early morning rain. 2013	48°/63°	-	38°
2012 Chicago Marathon Partly cloudy throughout the day. 2012	40°/49°	-	25°
2011 Chicago Marathon Clear conditions throughout the day. 2011	59°/79°	-	50°
2010 Chicago Marathon Partly cloudy throughout the day. 2010	60°/83°	-	49°
2009 Chicago Marathon Partly cloudy throughout the day. 2009	32°/43°	-	20°
2008 Chicago Marathon Partly cloudy throughout the day. 2008	62°/83°	-	56°
2007 Chicago Marathon Partly cloudy throughout the day. 2007	71°/86°	-	67°
2006 Chicago Marathon Cloudy skies throughout the day with rain clearing later. 2006	38°/40°	Light	33°
2005 Chicago Marathon Clearing in the afternoon. 2005	51°/58°	-	43°
2004 Chicago Marathon Partly cloudy throughout the day. 2004	50°/61°	-	43°
2003 Chicago Marathon Clear conditions throughout the day with early morning rain. 2003	48°/68°	-	42°
2002 Chicago Marathon Clear conditions throughout the day. 2002	39°/48°	-	23°
2001 Chicago Marathon Partly cloudy throughout the day. 2001	35°/52°	-	25°
2000 Chicago Marathon Becoming cloudy in the afternoon. 2000	54°/68°	-	51°

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